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Thread: Engine knock... Does this sound familiar?

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  1. 03-05-2011, 05:55 PM #1
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    Default Engine knock... Does this sound familiar?

    Ok, needing some help here guys...

    I'm working on a 2.25 petrol engine with an interesting knock. I'm going to try to record a sound clip so you guys can hear. In the meantime, an explanation will have to do...

    There is a knock that doesn't follow any pattern. With the valve cover off, I can hear that it's definitely coming from the valve-train...maybe the first 2 or 3 valves from front to back. I'll check clearances as soon as I can find my feeler blades.

    EDIT: Nvm...file wasn't the correct type for YouTube
    Last edited by 01001010; 03-11-2011 at 07:09 PM.
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  2. 03-05-2011, 06:26 PM #2
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    Ok, here's the vid...

    http://www.youtube.com/watch?v=C5QiTyNyxmc
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  3. 03-05-2011, 06:37 PM #3
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    If the engine wasn't running so smoothly, I'd almost say it sounds like the "snap" of a leaky spark plug wire arcing to ground.

    It seems like it's a one-click-per-two-revs noise, so that should narrow it down.
    --Mark

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  4. 03-05-2011, 06:46 PM #4
    bkreutz
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    Sounds like a valve sticking and then snapping closed, and I think I see a matching hesitation in the lowest rocker arm in that film clip. Just a guess on my part. (without being there myself, you can usually tell a sticking valve by looking for a fluctuating needle on a vacuum gauge.)
    Gale Breitkreutz
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  5. 03-05-2011, 07:24 PM #5
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    Wow...thanks for the quick response guys.

    AirOne... I know exactly what you are talking about but this definitely sounds like metal slapping metal.

    bkreutz... That's the first thing I thought but it seems to sound louder on side opposite to the valves. This still remains high on the "Culprit List" though.
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  6. 03-05-2011, 07:28 PM #6
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    Could there be a faulty tappet?
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